Signal correction apparatus and method of steer-by-wire system

Abstract

A signal correction apparatus of an SBW system may include: a command signal receiving/transmitting unit configured to receive a command signal transmitted through a vehicle communication network by an upper level apparatus, and transmit a command signal, obtained by correcting the linearity of the received command signal, to a lower level apparatus through the vehicle communication network; a buffer unit configured to store the command signal, received through the command signal transmitting/receiving unit, as an original signal; and a control unit configured to generate a command signal whose linearity is corrected, by correcting the linearity of the original signal by using the original signal stored as the command signal in the buffer unit and a command signal obtained by delaying the command signal, stored in the buffer unit, by designated one unit time.

What is claimed is: 
     
       1. A signal correction apparatus of an SBW (Steer-By-Wire) system, comprising:
 a command signal transceiver configured to receive a command signal transmitted through a vehicle communication network by an upper level apparatus, and transmit a command signal, obtained by correcting the linearity of the received command signal, to a lower level apparatus through the vehicle communication network; 
 a buffer configured to store the command signal, received through the command signal transceiver, as an original signal; and 
 a control circuit configured to generate a corrected command signal whose linearity is corrected by correcting a linearity of the original signal using the original signal and a delayed command signal obtained by delaying the original signal by a designated one unit time. 
 
     
     
       2. The signal correction apparatus of  claim 1 , wherein the upper level apparatus transmits a command signal at an upper level through the vehicle communication network according to a designated command signal transfer system of the SBW system, and
 the lower level apparatus receives a command signal at a lower level through the vehicle communication network according to the designated command signal transfer system of the SBW system. 
 
     
     
       3. The signal correction apparatus of  claim 1 , further comprising a count signal transceiver configured to receive a count signal transmitted by the upper level apparatus and transmit the count signal to the lower level apparatus. 
     
     
       4. The signal correction apparatus of  claim 3 , wherein the count signal is separately transmitted/received in synchronization with the command signal received through the vehicle communication network in order to check a period and linearity of the command signal, and constantly increased by a designated specific count value at each designated unit time in each period. 
     
     
       5. The signal correction apparatus of  claim 1 , wherein the control circuit is configured to determine whether the linearity of the command signal received through the vehicle communication network is maintained by using a count value of a count signal. 
     
     
       6. The signal correction apparatus of  claim 5 , wherein in order to determine whether the linearity of the command signal is maintained, the control circuit is configured to determine whether a delay or peak occurs by using a count value of a count signal in each period of a plurality of periods. 
     
     
       7. The signal correction apparatus of  claim 1 , wherein the control circuit is configured to check a count value of a count signal, received in synchronization with the command signal, in each period of a plurality of periods, and configured to determine that the command signal was delayed when the same count value as that in a previous period is retained in a current period. 
     
     
       8. The signal correction apparatus of  claim 7 , wherein in response to determining the command signal is not delayed, the control circuit is configured to generate a command signal to be transmitted to a lower level apparatus by using the command signal delayed by one unit time of the corresponding period. 
     
     
       9. The signal correction apparatus of  claim 7 , wherein in response to determining the command signal was delayed, the control circuit is configured to generate a command signal to be transmitted to a lower level apparatus by using the original signal of the corresponding period. 
     
     
       10. The signal correction apparatus of  claim 1 , wherein the control circuit is configured to check a count value of a count signal, received in synchronization with the command signal, in each period of a plurality of periods, and configured to determine that the command signal was delayed when a count value which has doubled from that in a previous period is detected in a current period. 
     
     
       11. The signal correction apparatus of  claim 10 , wherein in response to determining no peak occurs in the command signal, the control circuit is configured to generate a command signal to be transmitted to a lower level apparatus by using the command signal delayed by one unit time in a corresponding period. 
     
     
       12. The signal correction apparatus of  claim 10 , wherein in response to determining a peak occurred in the command signal, the control circuit is configured to generate a command signal to be transmitted to a lower level apparatus by using a half of an increase of the original signal in a corresponding period. 
     
     
       13. A signal correction method of an SBW system, comprising:
 receiving, by a control circuit of a signal correction apparatus of an SBW system, a command signal from an upper level apparatus; 
 storing, by the control circuit, the command signal as an original signal in a buffer; 
 determining, by the control circuit, whether the linearity of the command signal is maintained; and 
 generating, by the control circuit, a corrected command signal whose linearity is corrected by correcting a linearity of the original signal using the original signal and a delayed command signal obtained by delaying the original signal by a designated one unit time in response to determining the linearity of the command signal is not maintained. 
 
     
     
       14. The signal correction method of  claim 13 , wherein in the determining of whether the linearity of the command signal is maintained, the control circuit checks a count value of a count signal, received in synchronization with the command signal, in each period of a plurality of periods, and determines that the command signal was delayed when the same count value as that in a previous period is retained in a current period. 
     
     
       15. The signal correction method of  claim 13 , wherein in order to correct the linearity of the original signal, the control circuit generates a command signal to be transmitted to a lower level apparatus by using the command signal delayed by one unit time in a corresponding period in response to determining the command signal is not delayed. 
     
     
       16. The signal correction method of  claim 13 , wherein in order to correct the linearity of the original signal, the control circuit generates a command signal to be transmitted to a lower level apparatus by using the original signal of a corresponding period, in response to determining the command signal was delayed. 
     
     
       17. The signal correction method of  claim 13 , wherein in the determining of whether the linearity of the command signal is maintained, the control circuit checks a count value of a count signal, received in synchronization with the command signal, in each period of a plurality of periods, and determines that the command signal was delayed in response to determining a count value which has doubled from that in a previous period is detected in a current period. 
     
     
       18. The signal correction method of  claim 13 , wherein in order to correct the linearity of the original signal, the control circuit generates a command signal to be transmitted to a lower level apparatus by using the command signal delayed by one unit time in a corresponding period in response to determining no peak occurs in the command signal. 
     
     
       19. The signal correction method of  claim 13 , wherein in order to correct the linearity of the original signal, the control circuit generates a command signal to be transmitted to a lower level apparatus by using a half of an increase of the original signal of a corresponding period in response to determining a peak occurred in the command signal.